1: (4-Hydroxymethyl-2-nitro-phenoxy)-acetic acid (2R,3R,4S,5R,6S)-4,5-diacetoxy-3-(9H-fluoren-9-ylmethoxycarbonyloxy)-6-methoxy-tetrahydro-pyran-2-ylmethyl ester With Cl3CC(=NH)OCH2-Merrifield resin; methylamine in ethanol; dichloromethane 0.166667 h; 2: acetic anhydride With pyridine in tetrahydrofuran; dichloromethane 2 h; Further stages.;